I originally took this to be a sincere confession of a shell of a man dying at the hands of an abuser. In other words, the "he made me what I am" part I took to mean that he literally would not have been so evil if it were not for Frieza's evil influence. I was so moved by this scene and Vegeta's vulnerability, I (clearly) had to put his quote in my signature.We worked so hard for him. We did everything he asked of us and more. He took me from my father when I was just a little boy. He made me do whatever he wanted and said he would kill my father if I didn't. I did everything he asked but he killed him anyway along with everyone else. He was scared of us. Scared that a Super Saiyan would be born to rise up and overthrow him... Kakarot, please. Destroy Frieza. He made me what I am. Don't let him do it to anyone else.--Vegeta
(taken from Dragon Ball Wiki, source is from the original DBZ anime)
At the same time, I have seen others argue that Frieza actually had no impact on the man he was, since he is a Saiyan and Saiyans are naturally inclined to aggression.
I am not satisfied with that interpretation. I believe that he had to have been sincere. There had to have been some change in Vegeta's character or motivations due to Frieza that incites such regret in him. Even so, I understand the point that Vegeta's a Saiyan, so his genes could be part of it. But his tears tell me something else, and I don't know what.
What do you guys think?